diff --git a/lib/omniauth/strategies/base_strategy.rb b/lib/omniauth/strategies/base_strategy.rb
index 2ca2896..bd2e4b6 100644
--- a/lib/omniauth/strategies/base_strategy.rb
+++ b/lib/omniauth/strategies/base_strategy.rb
@@ -7,6 +7,7 @@ module OmniAuth
   module Strategies
     class BaseStrategy < OmniAuth::Strategies::OpenIDConnect
       class APIError < StandardError; end
+      class ClientCredentialsError < StandardError; end
 
       def public_key
         @public_key ||= if options.discovery
@@ -18,6 +19,13 @@ def public_key
                         end
       end
 
+      def client
+        super
+      rescue AttrRequired::AttrMissing
+        raise ClientCredentialsError,
+              "#{options[:name].camelize} client credentials not found. Please check your environment."
+      end
+
       def self.decode_logout_token(token)
         jwks = fetch_jwks
         JSON::JWT.decode(token, jwks)